Legend not updating dynamically when using an atlas

[NadegeOdonat]

What is the bug or the crash?

When inserting dynamic values in a symbology (in my case dyamic ranges for a color scale), the maps are behaving correctly. However when the legend is filled dynamically, either in the symbology or in the legend object directly on the map, the text displayed does not update, and keeps showing the ranges for the first atlas feature. The title is correctly refreshed, but the items legends stay stuck. Trying to force a refresh by applying a change (adding a space for example) doesn't do anything either.

(also, yes, I'm aware that it's bad practice to have the same color represent different ranges on similar maps, but I have good reasons to do so)

Steps to reproduce the issue

1. Create an atlas table (in my case in Open office). Here I put my data name (gp_tax), and three values to generate the ranges (s1, s2, s3)

2. Create the symbology using the @atlas_feature attributes

3. Create your map layout, generate an atlas, and add a legend. Make sure it's named dynamically (obviously)

4. Check how the legend look on the first feature. Everything looks just right

5. Check how the legend look on the next features. While the map is behaving correctly and the legend title refresh properly, the items don't update and keep displaying the first ranges

Versions

QGIS version
3.28.6-Firenze
QGIS code revision
868c9fa
Qt version
5.15.3
Python version
3.9.5
GDAL/OGR version
3.6.4
PROJ version
9.2.0
EPSG Registry database version
v10.082 (2023-02-06)
GEOS version
3.11.2-CAPI-1.17.2
SQLite version
3.41.1
PDAL version
2.5.2
PostgreSQL client version
unknown
SpatiaLite version
5.0.1
QWT version
6.1.6
QScintilla2 version
2.13.1
OS version
Windows 10 Version 2009

Active Python plugins
dataexplorer
3.1.1
datagrandest
2.01
DataPlotly
4.0.0
lizmap
3.14.0
QuickOSM
2.2.0
db_manager
0.1.20
MetaSearch
0.3.6
processing
2.12.99
sagaprovider
2.12.99

Supported QGIS version

• I'm running a supported QGIS version according to the roadmap.

New profile

• I tried with a new QGIS profile

Additional context

No response

[DelazJ]

And when you export, the output is as in the preview? Just wanted to check whether the issue is not only at preview level...

[NadegeOdonat]

My bad, I should have included that. The exported maps show the correct legend, it is indeed just at preview level.

[NadegeOdonat]

I don't know what changed but today, on the same project with updated layers on a very similar atlas, the legend labels do not show any of the dynamic numbers, and neither does the pdf output.

I've checked in the assistant that the correct value is outputed by the expression, and it does.

I'm now a confused geomatician. And contrary to what I said earlier the bug is not just at preview level